Editing Compression artifact (section)

=== Mosquito noise ===
Video compression artifacts include cumulative results of compression of the comprising still images, for instance [[Ringing artifacts#JPEG|ringing]] or other edge busyness in successive still images appear in sequence as a shimmering blur of dots around edges, called '''mosquito noise''', as they resemble mosquitoes swarming around the object.<ref name="dinhpatry">{{cite web|last1=Le Dinh|first1=Phuc-Tue|last2=Patry|first2=Jacques|title=Video compression artifacts and MPEG noise reduction|url=http://www.embedded.com/print/4013028|website=Embedded|access-date=19 February 2016}}</ref><ref>"'''3.9 mosquito noise:''' Form of edge busyness distortion sometimes associated with movement, characterized by moving artifacts and/or blotchy noise patterns superimposed over the objects (resembling a mosquito flying around a person's head and shoulders)."
[http://www.itu.int/rec/T-REC-P.930-199608-I ITU-T Rec. P.930 (08/96) Principles of a reference impairment system for video]</ref> The so-called "mosquito noise" is caused by the block-based [[discrete cosine transform]] (DCT) compression algorithm used in most [[video coding standards]], such as the [[MPEG]] formats.<ref name="pcmag">{{cite web |title=Mosquito noise |url=https://www.pcmag.com/encyclopedia/term/55914/mosquito-noise |website=[[PC Magazine]] |access-date=19 October 2019}}</ref>